This is truly impressive. While the X3 line is apparently good, this one is truly atrocious. It looks like it was put together by monkies. Trainee monkies. When tested, both the ones supplied failed to go above 364W, less than half of the rated capacity. After that, one of the units had burned out. The unit is advertised as having a 75% efficiency. Given there is a movement to get PSUs over 80%, and good units can be up towards 90%, this is an odd choice.
Basically, stay well clear ;)